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  1. #1

    Question What spark plug to use?

    Bought a used 1996 GMC Sierra extended cab, 4X4 long box with 7.4/454 motor, auto tranny, 3.73 gears, with 219.000Km/137,000M on it.
    I am wondering what brand and type of plug to use in it.
    Here I hope are pictures of one of them I took out tonight to look at.



  2. #2

    Default

    i would go with the bouch platinum+4 plugs 6.99 at checker o'rilelly auto parts or if you can afford them deffinitly get the pulsar plugs about 45$ for 2 of them you'll get a little better mpg as well

  3. #3

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    isnt it true that using those fancy plugs will only make a difference if you are running boost? unless i guess as in this case they are in bad shape

  4. #4

    Default

    i have had good luck with bosch platinum 4
    PETE
    95 GMC Sierra 2500
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    Sold :(
    1999 Jeep Cherokee, 3" Rustys lift, 33" BFG MT's, locked, armored: Rolled :(
    2000 Jeep Grand Cherokee Limited. K&N Intake, Custom Kolak Exhaust


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  5. #5
    Jr. Engineer
    Join Date
    Jan 2009
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    Rochester, MN
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    231

    Default

    OEM AC Delcos. I've heard people talking about getting better MPG and power and whatnot with a fancy plug. You are never going to notice any difference whatsoever! With certain applications such as boosted engines some people do like to use a copper plug for heat transfer reasons which I think still does not really matter. I would just go with the OEM plug because you are probably the least likely to havea problem with them. I have also heard many stories about certain GM vehciles being very finicky about needing delco plugs, probably just a load of BS but a couple of really good mechanics I used to work with say they've seen it and will never put anything in a GM but an AC Delco OEM plug.
    Last edited by mjalstad; 03-01-2009 at 11:16 PM.
    99 Silverado Z71 4.8
    2" Suspension lift (Add-a-leafs and leveling keys)
    Long tube headers with 3" offroad Y-Pipe
    Volant Cold Air Intake with Ram Air Intake Tube
    Jet Mass Air Flow Sensor
    Diablosport Predator Tuner

    Previous Truck:
    97 Suburban K1500
    3" Body lift
    2" Suspension Lift (Add-a-leafs and cranked up torsion bars)
    35" Yokohama M/T's
    K&N Intake
    Airraid Throttle Body Spacer
    Hypertech Programmer
    Dual Flowmasters

  6. #6

    Default

    Best way to figure out what Bosch plug is for you:
    Take eight of them and put them in a bucket of water. Whichever ones float, use them.
    Definitely stick with AC-Delco. They cost as much as a Platinum 4, but they'll last twice as long.

  7. #7

    Default

    Quote Originally Posted by Chris Miller View Post
    Best way to figure out what Bosch plug is for you:
    Take eight of them and put them in a bucket of water. Whichever ones float, use them.
    Definitely stick with AC-Delco. They cost as much as a Platinum 4, but they'll last twice as long.
    LMAO!!!!!!!111

    That's funny but oh so true. A/C Delco plugs are designed to work in GM Engines. I just changed the Iridium plugs in my truck. They had 68K on them and they looked as new. The gap was even the same as the new plugs. Had I known this I would have left them in but I already purchased the new plugs.

    The rule of thumb is A/Cs in GMs, Autolites in Fords and Champions in Mopars. Send the rest of them overseas! <GBG>
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  8. #8

    Default

    That's some damnd good info! Thanks. I'll stick with delko

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